post-build.cjs

import { readFileSync, readdirSync, writeFileSync, copyFileSync } from 'fs'

// append our api modules to `exports` in `package.json` then write it to `./dist`
const pkg = JSON.parse(readFileSync('package.json', 'utf8'))
const modules = readdirSync('src')
    .filter((e) => e !== 'helpers')
    .map((mod) => mod.replace('.ts', ''))

const outputPkg = {
    ...pkg,
    exports: Object.assign(
        {},
        ...modules.map((mod) => {
            const temp = {}
            let key = `./${mod}`
            if (mod === 'index') {
                key = '.'
            }

            temp[key] = {
                import: `./${mod}.js`,
                require: `./${mod}.cjs`,
            }
            return temp
        }),
        // if for some reason in the future we manually add something in the `exports` field
        // this will ensure it doesn't get overwritten by the logic above
        { ...(pkg.exports || {}) }
    ),
}
writeFileSync('dist/package.json', JSON.stringify(outputPkg, undefined, 2))

// copy necessary files like `CHANGELOG.md` , `README.md` and Licenses to `./dist`
const dir = readdirSync('.')
const files = [
    ...dir.filter((f) => f.startsWith('LICENSE')),
    ...dir.filter((f) => f.endsWith('.md')),
]
files.forEach((f) => copyFileSync(f, `dist/${f}`))